Black Coral Distribution in Italian: History
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Subjects: Environmental Sciences | Marine & Freshwater Biology
Contributor:
Michela Ingrassia

The aim of this entry is to present a review of the knowledge on the occurrence of black corals in the Italian seas, providing the first comprehensive distribution map of these species. The distribution of black corals may be considered the first step towards defining a more complete overview regarding the present knowledge on these vulnerable species. This study also highlights the need for the conservation programs protecting black corals in the Italian seas.

  • Antipatharia
  • vulnerable marine ecosystems
  • anthropogenic impact

1. Introduction

Black corals (Cnidaria: Anthozoa: Hexacorallia: Antipatharia) are characterized by arborescent vertical or monopodial growth forming three-dimensional habitats supporting high levels of biodiversity [1][2]. Antipatharian corals have been considered for a long time to be among the rarest and sporadic coral species in the Mediterranean Sea [3]. To date, it is well known that these corals are able to form dense aggregations forming pristine underwater forests [4].

Because of their rarity, black corals low growth rates, and low recovery ability, are considered extremely sensitive and listed as indicator species of vulnerable marine ecosystems (VMEs). For this reason, they are mentioned in several international agreements concerning marine ecosystem conservation (CITES Appendix II [available at http://www.cites.org ]; European Community 1999), in Annex III of the Berna Convention, in Annex II of the Barcelona Convention for the Mediterranean species, and are also categorized as “threatened” by the International Union for Conservation of Nature (IUCN) Red List of Mediterranean Anthozoa [5] (with the millennial life span L. glaberrima being the only one listed as “endangered”). The main anthropogenic impact affecting these corals is represented by fishing as artisanal and recreational activities and bottom trawling, which may cause the resuspension of fine sediments [4][6][7]. Rare activities related to the commercial fisheries of precious corals for the jewelry industry is also reported [8].

Review studies on deep coral assemblages in the Mediterranean Sea have mainly been limited to scleractinian corals (i.e., Lophelia and Madrepora [9][10]), while few studies were exclusively focused on the distribution of black corals in the Italian seas [4][11][12][13][14][15]. The Italian seas have an average depth of about 1500 m, and a maximum depth of about 5000 m. The main Italian seas are the Tyrrhenian, Adriatic, and Ionian, and the other seas are represented by the Ligurian and Corsica seas, and the Otranto, Messina, and Sicily straits. The seawater temperatures range from 12 °C to 13 °C during the cold season, and from 26 °C to 28 °C in the warm season. Temperatures at the seafloor are constant and range from 12 °C to 13 °C [16]. During the last decades, the temperatures of the Italian seas have significantly increased [17], which resulted in dramatic changes in biodiversity composition [16]. To date, 29 Italian Marine Protected Areas (MPAs) have been established, but this number strongly needs to be updated [18].

The aim of this study is to present a review of the knowledge on the occurrence of black corals in the Italian seas, providing the first comprehensive distribution map of these species. The distribution of black corals may be considered the first step towards defining a more complete overview regarding the present knowledge on these vulnerable species. This study also highlights the need for the conservation programs protecting black corals in the Italian seas.

2. Distribution Dataset and Methods

Table 1 shows dataset of black coral distribution in the Italian Seas. This dataset was created using all the available scientific literature and reports, starting from 1973 until today. For each site, when available, the following information was reported: region, ID (number code referred to the code reported in Figure 1 ), sites, sea, coral species, minimum and maximum depth, setting, substrate, anthropogenic impact, reference. The type of setting is based on the classification used by Gori et al. [19], whereas the substrate types were referred to those reported in the related scientific articles. The categories related to anthropogenic impact are represented by fishing activity (trawl and ghost nets, longlines, lines, ropes, other fishing gear) and lost garbage (e.g., plastic and metal objects).

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Figure 1. Distribution map of black corals in the Italian seas (red lines: 50-m isobaths; blue lines: 100-m isobaths; grey lines: isobaths of each 200 m interval). Number codes refer to the ID codes reported in Table 1.
Table 1. Dataset of the Italian submarine sites associated with black corals reported in the available scientific literature. Codes used for the black corals: AS, Antipathella subpinnata; AD, Antipathes dichotoma; AF, Antipathes fragilis; LG, Leiopathes glaberrima; PL, Parantipathes larix. Code nd means “no data”.
Region ID Site Sea Coral Min Depth Max Depth Setting Substrate Anthropogenic Impact Reference
Ligurian 1 Banco di S. Lucia SE Ligurian Sea AS, AD, LG, PL 140 210 Offshore banks and seamounts Deep rocky banks Fishing activity [4][20]
Sicily 2 Mantice Shoal Western Ligurian Sea AS 70 150 Shelf edge and upper slope Deep rocky banks Fishing activity [4]
3 Portofino Secca dell’Isuela Ligurian Sea AS 56 60 Shelf Shoal nd [15][21][22]
4 Bordighera West Ligurian Sea AS 63 63 Shelf nd nd [21]
5 Wreck Ravenna Ligurian Sea AS 75 90 Shelf Rocky bottom nd [18]
6 Punta Faro Ligurian Sea AS 63 77 Shelf Shoal nd [22]
37 Marco Bank Western Sicily LG 240 260 Offshore banks and seamounts Deep rocky banks Fishing activity [23]
38 Graham Shoal Strait of Sicily LG 95 150 Offshore banks and seamounts Shoal nd [24]
39 Favignana and Talbot Shoal Strait of Sicily LG 100 100 Offshore banks and seamounts Shoal nd [25]
40 Filicudi Aeolian islands Tyrrhenian Sea AD 75 300 Shelf edge and upper slope Rocks encrusted by coralline algae nd [26][27]
41 Filicudi Aeolian islands Tyrrhenian Sea LG 300 300 Deep areas Rocky bottom nd [26][27]
42 Cape San Vito Sicily Tyrrhenian Sea LG 275 286 Deep areas nd nd [25][26]
43 Messina Strait Secche di Favazzina AS 55 70   Rocky bottom nd [18]
44 Pantelleria   AS 70 100 Offshore banks and seamounts nd nd [18]
45 Northern Levanzo Island Tyrrhenian Sea AS 235 250 Deep areas nd nd [28]
46 Stromboli Tyrrhenian Sea AS 52 58 Shelf Rocky bottom nd [18]
47 Stromboli Tyrrhenian Sea LG 187 345 Deep areas Rocky bottom nd [29]
48 NE Stromboli Tyrrhenian Sea AD, PL 129,202 349, 202 Shelf edge and upper slope Rocky bottom nd [29]
49 Linosa Sicily channel AS 160 160 Shelf Bench terrace nd [30]
50 Linosa Sicily channel LG 200 200 Shelf edge and upper slope Bench terrace nd [30]
51 NE Lipari Tyrrhenian Sea AS 83 130 Shelf Rocks encrusted by coralline algae nd [29]
52 NE Lipari Tyrrhenian Sea AS 612 612 Deep areas Rocky bottom nd [29]
53 NE Lipari Tyrrhenian Sea PL 129 158 Shelf Rocks encrusted by coralline algae nd [29]
54 NE Lipari Tyrrhenian Sea AD 129 218 Shelf edge and upper slope Rocks encrusted by coralline algae nd [29]
55 SW Lipari Tyrrhenian Sea AD 207 298 Shelf edge and upper slope Rocky bottom nd [29]
56 Salina Tyrrhenian Sea PL 129 345 Shelf edge and upper slope, deep areas Rocky bottom nd [29]
57 Panarea Tyrrhenian Sea LG 187 345 Deep areas Vertical rocky walls nd [29]
58 SE Panarea Tyrrhenian Sea AD, PL 351,349 351,349 Deep areas Vertical rocky walls nd [29]
59 NW Filicudi Tyrrhenian Sea AD, LG 647 647 Deep areas Rocky bottom nd [29]
Campanian 14 Vedove Shoal (Capri) Tyrrhenian Sea LG 240 260 Deep areas Deep rocky banks Lost garbage [23]
15 Bay of Naples Tyrrhenian Sea AD, AS 200 200 Shelf edge and upper slope Rocks encrusted by coralline algae nd [15][26]
16 Naple Gulf Tyrrhenian Sea AF, AS 80 100 Shelf Rocky bottom nd [15][31]
17 Capri Island Tyrrhenian Sea AS 70 70 Shelf Shoal Fishing activity [15][26]
18 Capri Island Tyrrhenian Sea LG 160 260 Shelf edge and upper slope Rocky bottom nd [15][26]
Latium 11 Western Pontine Archipelago Tyrrhenian sea LG, PL 194 220 Offshore banks and seamounts Rocky bottom Fishing activity [32]
12 Western Pontine Archipelago Tyrrhenian sea AD, LG, PL 145 155 Shelf edge and upper slope Rocky bottom Fishing activity [32]
13 Western Pontine Archipelago Tyrrhenian sea LG, PL 130 138 Shelf Rocky bottom Fishing activity and lost garbage [32]
Tuscany 7 Montecristo Natural reserve Tyrrhenian sea AS, PL, LG 108 200 Shelf edge and upper slope Shoal nd [4]
8 Mezzo Canale Tyrrhenian Sea AS 70 70 Shelf nd nd [33]
9 Capraia Island Tyrrhenian Sea AS 75 90 Shelf Rocky bottom nd [15]
10 Elba Tyrrhenian Sea AS 60 94 Shelf Rocks encrusted by coralline algae nd [34]
Calabrian 19 Scilla Tyrrhenian Sea AS 50 100 Shelf Rocky bottom nd [1]
20 Golfo di S. Eufemia Tyrrhenian Sea AD
PL
AS		 70 120 Shelf Shoal nd [2]
21 Vibo Marina Tyrrhenian Sea AD 90 132 Shelf Shoal Fishing activity [26]
22 Favazzina Tyrrhenian sea northern border Messina Strait AS 62 72 Shelf Rocky bottom nd [35]
Apulia 23 Vieste Adriatic sea LG 350 350 Deep areas Rocky bottom Fishing activity [36]
24 Gallipoli Adriatic sea AS 70 70 Shelf Rocky bottom nd [15]
25 S. Maria di Leuca Ionian Sea LG 671 790 Deep areas Rocky bottom Fishing activity [9][26][37][38]
26 S. Maria di Leuca Ionian Sea AD 630 640 Deep areas Rocky bottom Fishing activity [38][39]
27 Torre Inserraglio Ionian Sea LG 45 45 Shelf nd Fishing activity [36]
28 Tremiti Islands Adriatic Sea AS 51 80 Shelf nd nd [40][33][41]
29 Porto cesareo Ionian sea LG 100 236 Shelf edge and upper slope Rocky bottom Fishing activity [36]
30 Porto cesareo Ionian sea LG 50 50 Shelf Rocky bottom Fishing activity [36]
  31 Capo Comino Eastern coasts of Sardinia AS 54 54 Shelf nd nd [15]
Sardinia 32 SW coasts of Sardinia Western Mediterranean Sea AD, PL, LG 210 210 Shelf edge and upper slope Shoal Fishing activity [42]
33 Rocky pinnacles off Carloforte Sardinian Sea AD, AS, LG,
PL		 120 170 Shelf edge and upper slope Rocky bottom Fishing activity and lost gabage [43]
34 Northern edge of Skerki Bank Sardinian Channel LG 520 650 Deep areas nd nd [28]
35 Western Carloforte Island Sardinian Sea LG 70 130 Shelf nd nd [34]
36 Posada canyon Sardinian Sea AS 152 156 Deep areas nd nd [20]

All the sites reported in Table 1 were used to create the first distribution map of black corals in the Italian seas ( Figure 1 ).

In the reported studies remotely operated vehicles (ROVs) and multibeam echosounders (MBES) were used for the identification of black coral specimens and the description of the geomorphological characteristics of the substrate [4][11][12][13][14][15].

3. Results

In addition, L. glaberrima shows the most bathymetric tolerance, ranging from 45 m to 730.5 m water depth. In detail, 62% of the Italian submarine sites are characterized by the occurrence of mixed black coral communities, which are most frequent in depths ranging from 50 m to 200 m.

In the Italian seas, black corals were found in different environmental settings, varying from shelf, shelf edge and upper slope, offshore banks and seamounts, and deep areas ( Figure 2 a). In detail, A. subpinnata displays the widest distribution, occurring in all above-mentioned settings with a maximum frequency on the shelf. Antipathes dichotoma , L. glaberrima , and P. larix are reported from the shelf, shelf edge and upper slope, offshore banks and seamounts, and deep areas. Parantipathes larix and A. dichotoma mainly occur in the shelf edge and upper slope, whereas L. glaberrima in the deep areas. Antipathes fragils is only reported from the shelf. The black corals observed in the Italian seas are settled on different exposed substrates represented by the rocky bottom, deep rocky banks, rocks encrusted by coralline algae, shoal, terrace, and vertical rocky walls ( Figure 2 b). The most common substrate types associated with these corals is represented by rocky bottom. A minor percentage, excluding A. fragils , were also associated with shoal, deep rocky banks, and rocks encrusted by coralline algae. Finally, in very few cases they were occurring on terraces and vertical rocky walls ( Figure 2 b).

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Figure 2. (a) Different settings and (b) substrate types where black corals were observed in the Italian seas.

The analysis of all the reported sites ( Table 1 ) has permitted the identification of the different anthropogenic impacts affecting the Italian sites where the black corals are settled ( Figure 3 ).

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Figure 3. Map of the Italian black coral communities that are affected or unaffected by anthropogenic impact.

These sites, representing 29% of the total, are found in water depths ranging from 45 m to 730.5 m (with a medium depth of 200 m), and are associated with the rocky bottom, deep rocky banks, and shoal substrates. The items affecting the black coral communities are represented by two main categories ( Table 1 ): fishing activity (trawl and ghost nets, longlines, lines, ropes, other fishing litter) and lost garbage (e.g., plastic and metal objects). A total of 83% of debris impacting the Italian sites is associated with fishing activity, whereas a few exceptions are related to lost garbage ( Table 1 ).

4. Discussion

Black corals have for a long time been considered to be rarest corals in the Mediterranean Sea [3]. The recent increase in the use of modern technological tools, such as ROVs, has permitted the documentation of the great variability of the coral communities occurring in Mediterranean environments e.g., [2][26][44][45]. Exploration of the submarine environment by ROV has represented a turning point in the updating knowledge on benthic communities, providing a valuable tool for the understanding of their geographical and bathymetrical distribution, and their morphological description and ecological aspects [15][46].

Our study is focused on the distribution analysis of the antipatharian corals already reported in the Italian seas. This first step highlighting the presence of the black corals should be considered more common than what supposed. The present review strongly supports the idea proposed by Bo et al. [47], that black corals are among the most conspicuous and widely distributed organisms of mesophotic Mediterranean coral communities (especially in a depth range from 60 m to 150 m). It is also confirmed that the majority occur on rocky bottom and shoals [45]. This statement could be due to the occurrence, in the mesophotic zone, of more favorable environmental factors able to enhance coral growth (which are lower levels of competition for space, food supply, temperature, currents rich in suspended matter, heterogeneity of substrate, rate of sedimentation [47]). According to present knowledge e.g., [1][45][47][48][49], currents rich in suspended matter are probably the major environmental factor influencing black coral settlement and composition in the Italian seas.

Probably, the occurrence of black corals in Italy on specific types of substrate (mainly rocky bottoms and isolated shoals) as well as their bathymetric distribution (within 50 m and 300 m depth), makes them more exposed to fishing activities, causing damage to vulnerable marine ecosystems. Furthermore, this impact represents a considerable concern, considering their specific characteristics such as 3D structure, long lived species, slow growth rates, and recovery ability [23][50][51]. Fishing impacts (including ghost nets) can lead to the direct removal or partial damage to coral colonies. The skeletons of the damaged corals may become overgrown by various fast growing organisms [4][52]. This kind of damage can have far-reaching and long lasting effects on the population dynamics of Mediterranean black corals, especially when their low growth rates are considered [42]. Despite of the distance from the coast, it is well known that rocky bottoms and isolated shoals are considered important targets for fishermen [23]. In addition, other factors are well known to influence fishing efforts [23][53][54], such as their depth, topography, and the fact that they could represent a refuge for many commercial species. The different entities of fishing disturbance could also be linked to different coral morphologies. In fact, the morphological characteristics (arborescent and erect structures) and the grade of flexibility of black corals may increase their resistance to mechanical friction, showing different mechanical responses to their entanglement [23][43][55].

Despite all this evidence, the only Italian MPA, containing black coral forests, is the Tremiti Islands Marine Protected Area [40]. All these findings indicate the need for actions focused on the implementation of effective management and proper conservation measures to preserve the Italian antipatharian corals.

This entry is adapted from the peer-reviewed paper 10.3390/d13070334

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